-3=3k+7

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Solution for -3=3k+7 equation: 



-3=3k+7

We move all terms to the left:

-3-(3k+7)=0

We get rid of parentheses

-3k-7-3=0

We add all the numbers together, and all the variables

-3k-10=0

We move all terms containing k to the left, all other terms to the right

-3k=10

k=10/-3

k=-3+1/3

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